“Worlds Finest” is the title given to the The Flash and Supergirl crossover that is set to air on March 28, 2016 at 8pm on CBS. IGN had a chance to interview some of the cast and producers of Supergirl over the past weekend at PaleyFest LA. According to the site the episode with include fun, jealousy, and a race between Kara and Barry.
Races between kryptonians such as Superman and the Flash have happened before and usually the Flash wins.
Head over to IGN to read the entire interviews.